Process for dyeing keratinous fibers with aminoindoles and oxidation dye precursors at basic Ph's and dyeing agents
US5938792A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1997 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Jul 8, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/492
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to a process for dyeing keratinous fibres, which consists in applying to these fibres a composition containing, in a suitable medium for dyeing, at least one coupler of formula: ##STR1## where R.sub.1 denotes hydrogen or alkyl, PA1 R.sub.2 and R.sub.3 denote hydrogen, alkyl, COOR' where R' is alkyl or hydrogen, PA1 at least one of the groups R.sub.2 and R.sub.3 denoting hydrogen, PA1 R.sub.4 denotes hydrogen, alkyl, hydroxyalkyl, polyhydroxyalkyl or aminoalkyl, PA1 Z.sub.1 and Z.sub.2 denote hydrogen, alkyl, hydroxyl, halogen, alkoxy, PA1 at least one of the groups Z.sub.1 and Z.sub.2 is other than hydrogen PA2 at least one oxidation dye precursor, PA2 at least one oxidizing agent, the pH of the composition applied to the fibres being higher than 7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.